Shoe-sewing machine.



P. E. VALUIS.

sEoE SEWING MACHINE.

`xAPPLIUATION'FILED 00T. 30, 1912.

1,082,715, 1 y Patented 1360.30, 1913.

2 SHEETS-SHEET 1.

F. E. VALOIS.

SHOE SEWING MACHINE.

APPLICATION FILED 00T. 3o. 1912.

Patentafnec. 30, 1913.

2 SHEETS-SHEET 2.

*wf/1555125' l w 55%@ I' STATES PATENT @FFIC FELIX E. VALUIS, 0F HAVERI-IILL, MASSACHUSETTS, ASSIGNOR TO HAMEL SHOE MACHINERY COMPANY, OF LYNN, MASSACHUSETTS, A. CCRORATION OF MASSA- CI-IUSETTS.

SHOE-SEWING MACHINE.

Speeication of Letters Patent.

Patented Dec. 3C, 1913.

To all 107mm t may concern Be it known that I, FELIXE. VALois, a citizen of the United States, residing at Haverhill, county of Essex, State of Massachusetts, have invented a certain new and useful Improvement in Shoe- Sewing Machines, of which the following is a specification, reference being had therein to the accompanying drawings.

My invention relates to sewing machines and particularly to the looper of machines employed in the manufacture of boots and shoes. The looper of such a sewing machine requires to be given what may be termed a movement in two directions in one plane, that is, a movement forward and back and a movement sidewise, the said movements being properly timed with relation to the movements of the needle and other parts of the machine. Difficulty has been experienced in the operation of machines of this character because the cam or cams operating the looper not being positive, have worn rapidly; also have failed to give the looper the predetermined mot-ion when run at high speed. Accordingly I have devised a new and improved machine for giving to the looper the requisite movements. The machine embodying my invention may be run at high speed without injury to the cams and the looper will always be given thepredeter-mined movements.

The invention will be fully understood from the following description taken in connection with the accompanying drawings, and the novel features thereof are pointed out and clearly defined in the claims at the close of this specication.

In the drawings, Figure 1 is a side elevation of a sewing machine embodying my invention. Fig. 2 is a front elevation of the machine shown in Fig. l.

Having reference to the drawings, at 11 is shown the looper. For the proper formation of the stitch it is necessary that the looper be moved forward and back, z'. c. in the plane of the paper 1n Fig. 1, and sidewise, c. in the plane of the paper in Fig. 2. This looper is mounted on a curved looper lever 12. The looper lever 12 is slotted or forked at 13 to engage a block 14 which is itself mounted on a stud 15. The stud 15 is on a swivel 31 which is formed integral with the bolt 16 so that the looper lever can swing on the bolt 16 as an axis.

From the foregoing it will be seen that the forward and back movement of the looper, that is the movement in the plane of the paper in Fig. 1 is accomplished by causing the looper to slide on the block la while the sidewise movement, that is the movement in the plane of the paper in Fig. 2 is produced by the swinging of the looper lever about the bolt 16 as a pivot. The last mentioned movement is imparted to the looper by a cam groove 17 in the periphery of a cylindrical cam 1S mounted on the main shaft 19. This cam groove is engaged by a cam roll 34 on the end of the looper lever 12. I also provide the main looper lever 12 with bearing rolls 32 which roll on the outer cylindrical surface of the cylindrical cam 18 to tal-:e the pressure of the lever 12. A spring 33 serves to hold the rolls 32 in contact with the cylindrical surface of the cam and the cam roll 34k does not contact with the bottom of the groove. This construction is such that as the rolls 32 are always in contact with the cylindrical surface of the cam, forming in effect the pivot on which the looper lever is moved to give it its movement forward and back, z'. c. in the plane of the paper in Fig. 1, it results that the lower end of the looper lever always has its true movement which would not be the case if the roll were allowed to get out of contact with the cylindrical surface of the cam.

To give the looper lever 12 its other movement, I provide a secondary looper lever 2O pivoted at 21 to the frame of the machine. One end of this secondary looper lever 20 is forked, as shown at 22, to engage a block 28 pivoted at 24 to the main looper lever 12. The other end of the secondary looper lever 20 is extended rearwardly and is provided at its end with a cam roll 25 engaging the groove 26 in the face of a plate cam.

In practice I lind it convenient to employ two independent cams on the same shaft, but of course it will be understood that the same result may be attained by making two cam grooves, one in the side face and the other in the periphery of the same cylindrical piece of metal. As the cams revolve, the cam groove 26 moves the lever 25 and swings the secondary looper lever about the pivot 21. This action slides the main looper lever 13 on the block lll about the roll 32 as a pivot. The movements imparted to the main looper lever 12 by the groove in the cylindrical cam do not interfere with the movement of the main looper lever imparted to it by the other cam, because the connecion between the main looper lever and the secondary looper lever is a sliding one. As both cam rolls are confined between the walls of the respective cam grooves in which they move, the movements imparted to the looper lever are positive and the machine may be run at a high speed. Furthermore, as the cam rolls are always guided by the walls of the cam grooves it is impossible for them to strike the walls of the cam grooves a. blow and thereby to wear a depression therein which in time will interfere with the action of the cams.

TWhat l claim is:

l. ln a sewing machine, the combination with a swinging support, a main looper lever, a pivot therefor, a slide and block connection between the support and the main looper lever, a cam swinging the looper lever about said support, a secondary looper lever having a slide and block connection with the main looper lever and a cam acting on the secondary looper lever to swing the main looper lever about its pivot.

2. In a sewin machine, the combination of a main looper lever, a secondary loopen lever acting on the main looper lever, a cam having a cylindrical periphery with a cam groove therein to act-nate the main looper lever, a cam to actuate the secondary looper lever, a bearing roll on the end of the main looper lever and in contact with the cylindrical surface of the first mentioned cam and forming a pivot for the main looper lever and a spring to hold the bearing roll in contact with the surface of said cam.

3. lin a sewing machine, the combination with a main looper lever, a cam to actuate said main looper lever and having a cylindrical surface with a cam groove therein, a bearing roll forming a pivot for the main looper lever and contacting with the cylindrical surface of the cam, a cam follower on the said main looper lever and engaging said cam groove, a secondary lever slidably connected with the main looper lever and a plate cam actuating said secondary lever.

In testimony whereof I afliX my signature, in presence of two witnesses.

FELIX E. VALOIS. lfitnesses JOHN H. PARKER, ALICE H. lVlonnIsoN.

Gopes of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents, Washington, D. C. 

